Post on 28-May-2020
I . T H E N E R V O U S S Y S T E M
B I O L O G Y & B E H A V I O R
I . NEURONS - Continued
B. Communication Process• Synapse -The junction between the axon terminals of
one neuron & the dendrites of another neuron
Synapse
Axon Terminal of the sending transmitter
Sacs containing neurotransmitters
Neurotransmitters move from axon terminal to next neuron
• Neurotransmitter -Chemical messenger that carries impulses across the synaptic gap across transmitters
Fast Fact - Abuse of the drug ecstasy, inhibits natural production of the neurotransmitters Endorphins; when off of the drug, depression is a chronic disorder
I . NEURONS - Continued
B. Communication Process
Cell Body
Axon Terminals
AxonSynapse
Neurotransmitters
Cell Body
Axon Terminals
Axon
Action Potential -electrical charge that travels down its axon
Reuptake - the sending neuron reabsorbs the excess neurotransmitters from the synapse
Action Potential -electrical charge that travels down its axon
Reuptake - the sending neuron reabsorbs the excess neurotransmitters from the synapse
I . NEURONS - Continued
B. Communication Process
I . THE NERVOUS SYSTEMThe system that regulates the body's responses to internal & external stimuli. Consists of the
A. Central Nervous System
B. Peripheral Nervous System
- consists of the1. BRAIN & 2. SPINAL CORD - column of nerves within the spine
that transmits messages to & from the brain.
- communicates between the central nervous system & all parts of the body.1. Somatic Nervous system - transmits senses to the
central nervous system. temp – pressure2. Autonomic Nervous System(ANS) -regulates the
body’s vital functions, Ex. heart beat, breathing, digestion, & blood pressure
Fast Fact:The spinal cord is as thick as a thumb.
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